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JP2001511258A - Fill level measuring device for automotive fuel tanks - Google Patents

Fill level measuring device for automotive fuel tanks

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Publication number
JP2001511258A
JP2001511258A JP52960299A JP52960299A JP2001511258A JP 2001511258 A JP2001511258 A JP 2001511258A JP 52960299 A JP52960299 A JP 52960299A JP 52960299 A JP52960299 A JP 52960299A JP 2001511258 A JP2001511258 A JP 2001511258A
Authority
JP
Japan
Prior art keywords
fuel tank
measuring
fuel
supply device
filling level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP52960299A
Other languages
Japanese (ja)
Inventor
ブラウン ハンス
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of JP2001511258A publication Critical patent/JP2001511258A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/06—Fuel tanks characterised by fuel reserve systems
    • B60K15/061—Fuel tanks characterised by fuel reserve systems with level control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/077—Fuel tanks with means modifying or controlling distribution or motion of fuel, e.g. to prevent noise, surge, splash or fuel starvation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G01F23/18—Indicating, recording or alarm devices actuated electrically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
    • B60K2015/03217—Fuel level sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0082—Devices inside the fuel tank other than fuel pumps or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8326—Fluid pressure responsive indicator, recorder or alarm

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

(57)【要約】 充填レベル測定装置（１２）が、燃料タンク（１０）内に配置された測定管（１４）を有しており、この測定管（１４）が、燃料タンク（１０）内に配置された供給装置（４０）によって自動車の内燃機関（４６）の噴射装置（４４）に送られる燃料の部分流によって満たされる。差圧センサ（２４）の一方の測定入力部（２６）が、液体静力学的な圧力によって測定管（１４）の下側の端部（３０）で負荷されていて、差圧センサ（２４）の他方の測定入力部（２８）が、液体静力学的な圧力によって燃料タンク（１０）の底部（１６）で負荷されている。供給装置（４０）の運転時には、測定管（１４）内に公知の高さ（ｌｏ）の燃料柱が生ぜしめられるので、差圧センサ（２４）の出力信号（ｕ）によって、評価装置（３２）において燃料タンク（１０）の現時点の充填レベル（ｈ（ｔ））を検出することができる。測定管（１４）が、その下側の端部（３０）付近に開口（５６）を有しており、この開口（５６）によって供給装置（４０）の停止時に、測定管（１４）内に燃料タンク（１０）内と同じ充填レベルを生ぜしめ、差圧センサ（２４）のオフセットを検出することができる範囲内で測定管（１４）を空にすることができる。 (57) [Summary] A filling level measuring device (12) has a measuring pipe (14) arranged in a fuel tank (10), and the measuring pipe (14) is arranged in a fuel tank (10). Is filled by a partial flow of fuel which is fed to an injection device (44) of an internal combustion engine (46) of a motor vehicle by a supply device (40) arranged in the vehicle. One of the measuring inputs (26) of the differential pressure sensor (24) is loaded at the lower end (30) of the measuring tube (14) by hydrostatic pressure, and the differential pressure sensor (24) The other measurement input (28) is loaded at the bottom (16) of the fuel tank (10) by hydrostatic pressure. During operation of the supply device (40), a fuel column of known height (lo) is created in the measuring tube (14), so that the output signal (u) of the differential pressure sensor (24) causes the evaluation device (32). In), the current filling level (h (t)) of the fuel tank (10) can be detected. The measuring tube (14) has an opening (56) near its lower end (30), by means of which the feeding tube (14) is closed by the opening (56) when the supply device (40) is stopped. The same filling level as in the fuel tank (10) is created, and the measuring tube (14) can be emptied as far as the offset of the differential pressure sensor (24) can be detected.

Description

【発明の詳細な説明】 自動車の燃料タンクのための充填レベル測定装置 背景技術 本発明は請求項１記載の上位概念に記載の、自動車の燃料タンクのための充填 レベル測定装置に関するものである。 このような形式の充填レベル測定装置は、ドイツ連邦共和国特許出願公開第３ ９１４６３７号明細書に基づき公知である。この公知の充填レベル測定装置は燃 料タンク内に配置された測定管を有しており、この測定管は、燃料タンクの底部 を起点として少なくとも燃料タンクの、最高充填レベルにまで延びており、この 測定管内へ燃料が送られる。さらに充填レベル測定装置は差圧センサを有してお り、この差圧センサの一方の測定入力部は、測定管の下側の端部に接続されてい て、この差圧センサの他方の測定入力部は、燃料タンクの底部で液圧によって負 荷されている。測定管はオーバフロー開口を有しており、このオーバフロー開口 は少なくとも燃料タンクの最高充填レベルの位置に配置されている。測定管を、 燃料タンクの底部付近に配置された開口、もしくは弁によって燃料タンクの現時 点の充填レベルの高さにまで空にすることができる。測定管がオーバフロー開口 まで燃料で満たされた時と 、測定管が燃料タンクの、現時点の充填レベルまで空にされた時との差圧センサ の出力信号の差により評価装置で充填レベル測定を行うことができる。測定管内 への燃料の供給は戻し管路を介して行うことができ、この戻し管路を通って、自 動車の内燃機関によって消費されなかった燃料が、燃料タンク内へ戻し案内され る。戻し管路を通流する燃料は、状況によって熱せられているので、測定管内に ある燃料と、燃料タンク内にある燃料との間には温度差が生じ、この温度差は同 様に測定管内の燃料の密度と、燃料タンク内の燃料の密度との間にも結果的に差 を生ぜしめ、このために差圧センサの出力信号には誤差が生じてしまう。さらに 燃料供給システムも公知であり、この公知の燃料供給システムにおいては内燃機 関から燃料タンクへの戻し管路が設けられていないので、公知の充填レベル測定 装置は使用不可能である。 発明の利点 公知の充填レベル測定装置に対して本発明による、自動車の燃料タンクのため の充填レベル測定装置は、測定管内に送られる燃料が暖められないという利点、 および戻し管路のない燃料供給システムにおいても使用可能であるという利点を 有している。 本発明による充填レベル測定装置の、有利な形態と変化実施例とが請求項２以 下に記載されている。 図面 本発明による充填レベル測定装置の２つの実施例が、図面に示されていて、以 下に詳しく説明されている。図１は、自動車の燃料タンク内に配置された充填レ ベル測定装置の測定管が、燃料で満たされている状態の第１実施例を示す図であ り、図２は、燃料タンク内に配置された測定管が、燃料タンク内の燃料の現時点 の高さまで空にされた状態を示す図であり、図３は、充填レベル測定装置を有す る燃料タンクの第２実施例を示す図である。 実施例の説明 図１〜図３にはそれぞれ１つの、自動車の燃料タンク１０が図示されていて、 この燃料タンク１０は金属またはプラスチックから成っていてよい。燃料タンク １０内には充填レベル測定装置１２が配置されていて、この充填レベル測定装置 １２は燃料タンク１０の充填レベルを検出するために働き、この充填レベルは、 公知の形式で車両運転者の視界領域内に配置された表示器３４上に表示される。 充填レベル測定装置１２は、燃料タンク１０内に配置された、鉛直方向に延びる １つの測定管１４を有しており、この測定管１４の横断面は燃料タンク１０の横 断面に比べて著しく小さい。測定管１４は、たとえばプラスチックまたは金属か ら成っていてよく、燃料タンク１０の底部１６を起点として、この燃料タンク１ ０の天井部１８付近にまで延びている。測定管１４は、その上側の端部２０付近 に、燃料タンク１０内へ開口しているオーバフロー開口２２を有している。 さらに充填レベル測定装置１２は、燃料タンク１０に配置された差圧センサ２ ４を有している。この差圧センサ２４は２つの測定入力部２６，２８を有してお り、この場合に一方の測定入力部２６は、測定管１４の下側の端部３０に接続さ れていて、これにより測定管１４内の液圧柱の流体静力学的な圧力によって負荷 されている。差圧センサ２４の他方の測定入力部２８は、燃料タンク１０の底部 １６に接続されていて、これにより燃料タンク１０内の液圧柱の流体静力学的な 圧力によって負荷されている。差圧センサ２４の信号出力部は評価装置３２に接 続されていて、この評価装置３２によって表示器３４は再び制御される。差圧セ ンサ２４として、特に廉価であるマイクロマシンの圧力センサが使用されると有 利である。 燃料タンク１０内には供給装置４０が配置されていて、この供給装置４０によ って燃料は、燃料タンク１０から自動車の内燃機関４６の噴射装置４４に送られ る。供給装置４０はポンプ部分４１および駆動部分４２を有しており、この駆動 部分４２は電動モータとして構成されていると有利である。供給装置４０は、詳 しく図示されていない形式で燃料タンク１０内に保持されていて、この場合に燃 料タンク１０内にポット４８を設けることができ、このポット４８から供給装置 ４０は燃料を吸い上げている。このポット４８によって供給装置４０は、燃料タ ンク１０の充填レベルが低い場合でも十分に燃料を送ることができるということ が保証される。ジェットポンプまたは別のポンプによって、燃料を燃料タンク１ ０からポット４８内へ送ることができる。 供給装置４０は、内燃機関４６の運転時に常に一様の供給出力で運転されるの ではなく、供給装置４０の運転は、現時点の運転状態において内燃機関４６によ って消費される燃料量が、この供給装置４０によって供給されるように制御また は調節されることができる。このために供給装置４０の駆動部分４２に供給され る電力もしくはこの駆動部分４２に印加される電圧が変えられうる。供給装置４ ０の、必要量に関連して制御されるこの運転によって、内燃機関４６によって消 費されなかった燃料を燃料タンク１０内へ戻す必要はなくなる。供給装置４０の 、必要量に関連して制御されるこの運転に対して選択的に、燃料タンク１０内に 調圧器４５を配置することもでき、この調圧器４５は、供給装置４０の圧力側に 接続されている入口と、内燃機関４６の噴射装置４４に接続されている出口と、 燃料タンク１０内へ開口している戻し管４７とを有している。調圧器４５によっ て、少なくともほぼコンスタントな燃料圧が噴射装置４４内で調整される。この 構成においても、内燃機関４６から燃料タンク１０へ の戻し管路は必要ではない。調圧器４５を、たとえば供給装置４０と一緒に燃料 タンク１０内に保持することができ、または図１に図示されているように、燃料 タンク１０の開口３６を閉鎖している蓋３８に保持することもできる。 供給装置４０の圧力側からは燃料管路５０が、噴射装置４４と接続するために 導出している。燃料管路５０から、または供給装置４０の圧力側、たとえば供給 装置４０の接続管片５２から直接別の燃料管路５４が分岐しており、この別の燃 料管路５４は、充填レベル測定装置１２の測定管１４の下側の端部３０付近でこ の測定管１４内へ開口している。測定管１４内へ開口している燃料管路５４は、 噴射装置４４に通じている燃料管路５０よりも極めて小さい横断面を有している 。このために測定管１４内へ開口している燃料管路５４は、噴射装置４４へ通じ ている燃料管路５０に比べて絞られているので、供給装置４０からは、測定管１ ４内へよりも極めて多量の燃料量が噴射装置４４に送られる。供給装置４０が運 転される際には、この供給装置４０によって燃料が燃料管路５０を介して噴射装 置４４に送られ、かつ燃料が燃料管路５４を介して測定管１４内へ送られる。こ の場合に測定管１４は、燃料で満たされ、この過程は、図１に図示されているよ うに、燃料がオーバフロー開口２２の高さｌｏに達するまで続く。測定管１４内 へさらに燃料が供給される 場合には、燃料はオーバフロー開口２２を介して再び燃料タンク１０内へ流出す る。このために供給装置４０の運転時には測定管１４内に、規定された高さｌｏ を有する燃料柱が生じ、この燃料柱は、規定された流体静力学的な圧力を差圧セ ンサ２４の第１の測定入力部２６に生ぜしめる。差圧センサ２４の第２の測定入 力部２８は、燃料タンク１０内の燃料の高さｈを有する燃料柱によって生ぜしめ られた流体静力学的な圧力によって負荷されている。燃料タンク１０内の燃料柱 の現時点の高さｈが、燃料タンク１０の充填レベルである。したがって差圧セン サ２４の出力信号ｕ（ｔ）は、測定管１４内の流体静力学的な圧力と、燃料タン ク１０内の流体静力学的な圧力との差に比例している。差圧センサ２４の出力信 号ｕ（ｔ）は評価装置３２に送られ、これによってこの評価装置３２は、以下の 方程式に示されている出力信号ｈ（ｔ）を検出する： この場合にｇは重力加速度であり、ρは燃料の密度であり、ｋは差圧センサの伝 達係数（感度）である。ｕｏは、測定管１４内の液圧柱の高さが燃料タンク１０ 内の燃料の高さｈと等しい状態に対する差圧センサの出力信号である。供給装置 ４０が運転されない場合に、この状態が生じる。この場合に測定管１４は、高さ ｌｏにおけるオーバフロー開口２２までの燃料の状態から、図２に図示されてい るように、燃料タンク１０ 内の燃料の現時点の高さｈまで空になる。 図１および図２には充填レベル測定装置１２が、第１実施例に基づいて図示さ れており、この第１実施例においては供給装置４０が停止された際に燃料は、測 定管１４から燃料管路５４と供給装置４０とを通って燃料タンク１０内に流出す ることができる。選択的には、測定管１４はその下側の端部３０付近に、または 燃料管路５４は小さい開口５６を有することもでき、この開口５６を通って燃料 は、測定管１４から燃料タンク１０内へ流出することができる。この場合に開口 ５６は、ある所定の時間内において、供給装置４０の運転時にこの供給装置４０ によって測定管１４内へ送られる燃料量よりも少ない燃料しか、この開口５６を 通って流出できないように寸法設定されている。測定管１４を開口５６または供 給装置４０を介して燃料タンク１０と接続することによって、測定管１４内には 連通管の原理により、燃料タンク１０内と同じ高さｈを有する燃料が生ぜしめら れる。差圧センサ２４の、この状態で与えられる出力信号ｕｏは、この出力信号 ｕｏのオフセットを生ぜしめる。このオフセットは、差圧センサ２４の耐用年数 の間、充填レベル測定の精度を損なう様な、ある程度のドリフトを受ける。この オフセットは、前述の方程式に基づいて評価装置３２で考慮されるので、充填レ ベルを測定する場合に誤差を生ぜしめることはない。差圧センサ２４の出力信号 ｕｏを、供給装置４０の停止後その都度検出することができ、また評価装置３２ に記憶することができる。これによって供給装置４０の停止後その都度、出力信 号ｕｏのために記憶された数値を更新することができる。評価装置３２によって 検出された充填レベル信号ｈ（ｔ）は、図示されていない表示装置に連続的に示 される。 図３には第２実施例による充填レベル測定装置１２が図示されていて、この場 合に基本的な構造は第１実施例と同じである。第１実施例とは異なって、供給装 置４０と測定管１４との間の燃料管路５４に弁６０が配置されている。この弁６ ０は、図３において実線で示された第１の位置と、図３において鎖線で示された 第２の位置との間で切り換え可能であり、第１の位置でこの弁６０は測定管１４ を燃料管路５４を介して供給装置４０に接続しており、第２の位置でこの弁６０ は燃料管路５４を開放し、測定管１４を燃料タンク１０に接続している。弁６０ は、電気的に切り換え可能である電磁弁として形成されていてもよい。弁６０の 両方の位置間の切り換えを、評価装置３２によって制御することができる。通常 の形式では供給装置４０の運転時に弁６０は、測定管１４が供給装置４０に接続 されていて、これによって燃料で高さｌｏまで満たされる第１の位置にあるので 、差圧センサ２４と評価装置３２とによって燃料タンク１０の、現時点の充填レ ベルを検出することができる。所定の時間間隔で弁６０は、測定管１４を燃料タ ンク１０に接続し、差圧センサ２４の出力信号ｕｏの検出を可能にし、およびこ れによってゼロドリフトを補償するために、第２の位置に切り換えられる。弁６ ０のこの切り換えは、供給装置４０の停止時における内燃機関４６の静止状態時 だけでなく、供給装置４０の運転中にも行うことができる。 選択的に弁６０は、この弁６０によって一方の位置で燃料管路５４が開放され 、他方の位置で燃料管路５４が遮断されるように形成されていてもよい。この場 合に第１実施例におけるように、弁６０と測定管１４との間の燃料管路５４内に 、または測定管１４の下側の端部３０の領域に、この測定管１４を空にすること を可能にするために開口５６が設けられている。Description: BACKGROUND OF THE INVENTION The invention relates to a filling level measuring device for a vehicle fuel tank according to the preamble of claim 1. A filling level measuring device of this type is known from DE-A-3914637. The known filling level measuring device has a measuring tube arranged in the fuel tank, which extends from the bottom of the fuel tank to at least the highest filling level of the fuel tank, Fuel is sent into the measuring tube. Furthermore, the filling level measuring device has a differential pressure sensor, one measuring input of which is connected to the lower end of the measuring tube and the other measuring input of this differential pressure sensor. The section is hydraulically loaded at the bottom of the fuel tank. The measuring tube has an overflow opening which is arranged at least at the highest filling level of the fuel tank. The measuring tube can be emptied to the height of the current filling level of the fuel tank by means of an opening or a valve arranged near the bottom of the fuel tank. The filling level is measured by the evaluation device based on the difference in the output signal of the differential pressure sensor between when the measuring pipe is filled with fuel up to the overflow opening and when the measuring pipe is emptied to the current filling level of the fuel tank. be able to. The supply of fuel into the measuring tube can take place via a return line, through which fuel not consumed by the internal combustion engine of the motor vehicle is guided back into the fuel tank. Since the fuel flowing through the return line is heated depending on the situation, a temperature difference occurs between the fuel in the measuring pipe and the fuel in the fuel tank, and this temperature difference is likewise changed in the measuring pipe. A difference also results between the density of the fuel and the density of the fuel in the fuel tank, which results in an error in the output signal of the differential pressure sensor. Furthermore, fuel supply systems are also known, in which no return line from the internal combustion engine to the fuel tank is provided, so that the known filling level measuring device cannot be used. ADVANTAGES OF THE INVENTION In contrast to the known filling level measuring devices, the filling level measuring device for motor vehicle fuel tanks according to the invention has the advantage that the fuel fed into the measuring pipe is not warmed up, and the fuel supply without return lines It has the advantage that it can be used in a system. Advantageous embodiments and variants of the filling level measuring device according to the invention are described in the dependent claims. Drawings Two embodiments of a filling level measuring device according to the present invention are shown in the drawings and are described in detail below. FIG. 1 is a view showing a first embodiment in a state where a measuring pipe of a filling level measuring device arranged in a fuel tank of an automobile is filled with fuel, and FIG. 2 is arranged in a fuel tank. FIG. 3 shows a state in which the measuring pipe has been emptied to the current height of the fuel in the fuel tank, and FIG. 3 shows a second embodiment of a fuel tank having a filling level measuring device. DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 each show a motor vehicle fuel tank 10 which may be made of metal or plastic. A filling level measuring device 12 is arranged in the fuel tank 10 and serves to detect the filling level of the fuel tank 10, which filling level is determined in a known manner by the vehicle driver. It is displayed on a display 34 arranged in the view area. The filling level measuring device 12 has a vertically extending measuring tube 14 arranged in the fuel tank 10, the cross section of which is significantly smaller than the cross section of the fuel tank 10. . The measuring pipe 14 may be made of, for example, plastic or metal, and extends from the bottom 16 of the fuel tank 10 to the vicinity of the ceiling 18 of the fuel tank 10. The measuring tube 14 has an overflow opening 22 which opens into the fuel tank 10 near the upper end 20 thereof. Further, the filling level measuring device 12 has a differential pressure sensor 24 arranged in the fuel tank 10. This differential pressure sensor 24 has two measuring inputs 26, 28, one measuring input 26 being connected to the lower end 30 of the measuring tube 14, whereby the measuring It is loaded by the hydrostatic pressure of the hydraulic column in the pipe 14. The other measuring input 28 of the differential pressure sensor 24 is connected to the bottom 16 of the fuel tank 10 and is thereby loaded by the hydrostatic pressure of a hydraulic column in the fuel tank 10. The signal output of the differential pressure sensor 24 is connected to an evaluation device 32, which controls the display 34 again. It is advantageous if a particularly inexpensive micromachine pressure sensor is used as the differential pressure sensor 24. A supply device 40 is arranged in the fuel tank 10 and feeds fuel from the fuel tank 10 to the injection device 44 of the internal combustion engine 46 of the vehicle. The supply device 40 has a pump part 41 and a drive part 42, which is preferably designed as an electric motor. The supply device 40 is held in the fuel tank 10 in a manner not shown in detail, and in this case, a pot 48 can be provided in the fuel tank 10, from which the supply device 40 sucks up fuel. I have. The pot 48 ensures that the supply device 40 can deliver sufficient fuel even when the filling level of the fuel tank 10 is low. Fuel can be pumped from the fuel tank 10 into the pot 48 by a jet pump or another pump. The supply device 40 does not always operate with a uniform supply output when the internal combustion engine 46 is operating. The operation of the supply device 40 is based on the fact that the amount of fuel consumed by the internal It can be controlled or regulated as provided by device 40. For this purpose, the power supplied to the drive part 42 of the supply device 40 or the voltage applied to this drive part 42 can be changed. This operation of the supply device 40, which is controlled in relation to the required quantity, eliminates the need to return fuel not consumed by the internal combustion engine 46 into the fuel tank 10. Optionally, a pressure regulator 45 can be arranged in the fuel tank 10 for this operation, which is controlled in relation to the required quantity, of the supply device 40, the pressure regulator 45 being connected to the pressure side of the supply device 40. , An outlet connected to the injection device 44 of the internal combustion engine 46, and a return pipe 47 opening into the fuel tank 10. A pressure regulator 45 regulates at least a substantially constant fuel pressure in the injector 44. Also in this configuration, a return line from the internal combustion engine 46 to the fuel tank 10 is not required. The pressure regulator 45 can be held, for example, in the fuel tank 10 together with the supply device 40, or, as shown in FIG. 1, on the lid 38 closing the opening 36 of the fuel tank 10. You can also. From the pressure side of the supply device 40, a fuel line 50 leads out for connection with the injection device 44. A further fuel line 54 branches off directly from the fuel line 50 or from the pressure side of the supply device 40, for example from the connecting piece 52 of the supply device 40, which is connected to a filling level measuring device. In the vicinity of the lower end 30 of the twelve measuring tubes 14, an opening is made into this measuring tube 14. The fuel line 54 opening into the measuring tube 14 has a significantly smaller cross section than the fuel line 50 leading to the injector 44. For this reason, the fuel line 54 opening into the measuring pipe 14 is narrower than the fuel pipe 50 leading to the injection device 44, so that the fuel is supplied from the supply device 40 into the measuring pipe 14. A much larger amount of fuel is sent to the injector 44. When the supply device 40 is operated, it supplies fuel through the fuel line 50 to the injector 44 and fuel through the fuel line 54 into the measuring pipe 14. In this case, the measuring tube 14 is filled with fuel, and this process continues until the fuel reaches the height lo of the overflow opening 22, as shown in FIG. If more fuel is supplied into the measuring pipe 14, the fuel flows out again into the fuel tank 10 through the overflow opening 22. During operation of the supply device 40, a fuel column having a defined height lo 1 is generated in the measuring tube 14, and this fuel column applies a defined hydrostatic pressure to the first of the differential pressure sensor 24. In the measurement input unit 26 of The second measuring input 28 of the differential pressure sensor 24 is loaded by the hydrostatic pressure generated by a fuel column having a fuel height h in the fuel tank 10. The current height h of the fuel column in the fuel tank 10 is the filling level of the fuel tank 10. Therefore, the output signal u (t) of the differential pressure sensor 24 is proportional to the difference between the hydrostatic pressure in the measurement pipe 14 and the hydrostatic pressure in the fuel tank 10. The output signal u (t) of the differential pressure sensor 24 is sent to an evaluation device 32, which detects an output signal h (t) represented by the following equation: In this case, g is the gravitational acceleration, ρ is the density of the fuel, and k is the transfer coefficient (sensitivity) of the differential pressure sensor. uo is the output signal of the differential pressure sensor for a state where the height of the hydraulic column in the measuring pipe 14 is equal to the height h of the fuel in the fuel tank 10. This situation occurs when the supply device 40 is not operated. In this case, the measuring tube 14 is emptied from the state of the fuel up to the overflow opening 22 at the height lo to the current height h of the fuel in the fuel tank 10 as shown in FIG. 1 and 2 show a filling level measuring device 12 according to a first embodiment, in which the fuel is supplied from a measuring pipe 14 when the supply device 40 is stopped. The fuel can flow into the fuel tank 10 through the pipe 54 and the supply device 40. Alternatively, the measuring tube 14 may be near its lower end 30 or the fuel line 54 may have a small opening 56 through which fuel may flow from the measuring tube 14 to the fuel tank 10. Can flow out. In this case, the opening 56 is such that, during a certain period of time, less fuel than the amount of fuel delivered by the supply device 40 into the measuring pipe 14 during operation of the supply device 40 can flow out through the opening 56. Dimensions are set. By connecting the measuring pipe 14 to the fuel tank 10 via the opening 56 or the supply device 40, a fuel having the same height h as in the fuel tank 10 is generated in the measuring pipe 14 by the principle of a communication pipe. . The output signal uo of the differential pressure sensor 24 applied in this state causes an offset of the output signal uo. This offset experiences some drift during the useful life of the differential pressure sensor 24, which degrades the accuracy of the fill level measurement. Since this offset is taken into account by the evaluation device 32 based on the above-mentioned equation, no error is caused when measuring the filling level. The output signal uo of the differential pressure sensor 24 can be detected each time the supply device 40 stops and can be stored in the evaluation device 32. As a result, the numerical value stored for the output signal uo can be updated each time the supply device 40 is stopped. The filling level signal h (t) detected by the evaluation device 32 is continuously shown on a display device (not shown). FIG. 3 shows a filling level measuring device 12 according to a second embodiment, in which the basic structure is the same as in the first embodiment. Unlike the first embodiment, a valve 60 is arranged in the fuel line 54 between the supply device 40 and the measuring pipe 14. The valve 60 is switchable between a first position, shown by a solid line in FIG. 3, and a second position, shown by a dashed line in FIG. The measuring pipe 14 is connected to the supply device 40 via a fuel line 54, and in a second position the valve 60 opens the fuel line 54 and connects the measuring pipe 14 to the fuel tank 10. The valve 60 may be formed as an electrically switchable solenoid valve. The switching between both positions of the valve 60 can be controlled by the evaluation device 32. In the usual manner, when the supply device 40 is in operation, the valve 60 is connected to the differential pressure sensor 24 because the measuring tube 14 is in the first position, which is connected to the supply device 40 and is thereby filled with fuel to a height lo. With the evaluation device 32, the current filling level of the fuel tank 10 can be detected. At a predetermined time interval, the valve 60 connects the measuring tube 14 to the fuel tank 10 and enables the detection of the output signal uo of the differential pressure sensor 24, and thereby to a second position to compensate for zero drift. Can be switched. This switching of the valve 60 can be performed not only when the internal combustion engine 46 is stopped when the supply device 40 is stopped, but also when the supply device 40 is operating. Alternatively, the valve 60 may be formed such that the fuel line 54 is opened in one position and the fuel line 54 is shut off in the other position. In this case, as in the first embodiment, the measuring tube 14 is emptied in the fuel line 54 between the valve 60 and the measuring tube 14 or in the region of the lower end 30 of the measuring tube 14. An opening 56 is provided to allow for

───────────────────────────────────────────────────── 【要約の続き】 （２４）のオフセットを検出することができる範囲内で 測定管（１４）を空にすることができる。────────────────────────────────────────────────── ─── [Continuation of summary] Within the range where the offset of (24) can be detected The measuring tube (14) can be emptied.

Claims (1)

【特許請求の範囲】 １．自動車の燃料タンクのための充填レベル測定装置であって、燃料タンク（１ ０）内に測定管（１４）が配置されており、この測定管（１４）が燃料タンク（ １０）の底部（１６）を起点として少なくとも燃料タンク（１０）の、最高充填 レベルにまで延びており、また差圧センサ（２４）が設けられており、この差圧 センサ（２４）の一方の測定入力部（２６）が、測定管（１４）の下側の端部（ ３０）に接続されていて、他方の測定入力部（２８）が、測定管（１４）の外側 における燃料タンク（１０）の底部（１６）で液圧によって負荷されていて、測 定管（１４）内に燃料が送られ、測定管（１４）が、少なくとも燃料タンク（１ ０）の最高充填レベルの位置に配置されたオーバフロー開口（２２）を有してお り、測定管（１４）を燃料タンク（１０）の現時点の充填レベルにまで空にする ことができ、充填レベル測定を、測定管（１４）がオーバフロー開口（２２）ま で燃料で満たされた時と、測定管（１４）が燃料タンク（１０）の現時点の充填 レベルまで空にされた時との差圧センサ（２４）の出力信号の差により、評価装 置（３２）で行うことができる形式のものにおいて、 燃料タンク（１０）内に供給装置（４０）が配置 されていて、この供給装置（４０）によって燃料が、燃料タンク（１０）から自 動車の内燃機関（４６）の噴射装置（４４）に送られ、また測定管（１４）が、 供給装置（４０）によって送られた燃料の部分流によって満たされることを特徴 とする、自動車の燃料タンクのための充填レベル測定装置。 ２．供給装置（４０）が、噴射装置（４４）へのこの供給装置（４０）の管路（ ５０）に比べて絞られた接続部（５４）を介して、燃料を測定管（１４）内へ送 っている、請求項１記載の充填レベル測定装置。 ３．供給装置（４０）によって燃料が、測定管（１４）の下側の端部（３０）付 近でこの測定管（１４）内へ送られる、請求項１または２記載の充填レベル測定 装置。 ４．燃料が、測定管（１４）から供給装置（４０）を通って燃料タンク（１０） 内へ流出することによって、測定管（１４）を燃料タンク（１０）の現時点の充 填レベルまで空にすることができる、請求項１から３までのいずれか１項記載の 充填レベル測定装置。 ５．供給装置（４０）と測定管（１４）との間の接続部（５４）に弁（６０）が 配置されていて、この弁（６０）が、測定管（１４）が接続部（５４）を介して 供給装置（４０）に接続されている位置と、測 定管（１４）が燃料タンク（１０）に接続されている位置との間で切り換え可能 である、請求項１から３までのいずれか１項記載の充填レベル測定装置。 ６．供給装置（４０）と測定管（１４）との間の接続部（５４）に弁（６０）が 配置されていて、この弁（６０）が、測定管（１４）が接続部（５４）を介して 供給装置（４０）に接続されている位置と、接続部（５４）が遮断されている位 置との間で切り換え可能である、請求項１から３までのいずれか１項記載の充填 レベル測定装置。 ７．供給装置（４０）によって送られる燃料量が、自動車の内燃機関（４６）の 現時点の燃料必要量に関連して可変である、請求項１から６までのいずれか１項 記載の充填レベル測定装置。 ８．燃料タンク（１０）内に調圧器（４５）が配置されていて、この調圧器（４ ５）が、供給装置（４０）の圧力側に接続されている入口と、自動車の内燃機関 （４６）の噴射装置（４４）に接続されている出口と、燃料タンク（１０）内に 開口している戻し管（４７）とを有している、請求項１から６までのいずれか１ 項記載の充填レベル測定装置。[Claims] 1. A filling level measuring device for a fuel tank of an automobile, comprising: a fuel tank (1); 0), a measuring pipe (14) is arranged in the fuel tank (14). The highest filling of at least the fuel tank (10) starting from the bottom (16) of 10) Level and a differential pressure sensor (24) is provided. One measurement input (26) of the sensor (24) is connected to the lower end ( 30) and the other measuring input (28) is connected to the outside of the measuring tube (14). At the bottom (16) of the fuel tank (10) at The fuel is fed into the fixed pipe (14), and the measuring pipe (14) is provided at least in the fuel tank (1). 0) having an overflow opening (22) located at the highest filling level. Empties the measuring tube (14) to the current filling level of the fuel tank (10). The filling level measurement can be carried out by means of the measuring tube (14) up to the overflow opening (22). When the fuel tank is filled with fuel and the measuring pipe (14) fills the fuel tank (10) at the current time. Based on the difference between the output signal of the differential pressure sensor (24) and the time when the air is evacuated to the level, In the type that can be performed in the device (32),     Supply device (40) arranged in fuel tank (10) The fuel is supplied from the fuel tank (10) by the supply device (40). It is sent to the injection device (44) of the internal combustion engine (46) of the vehicle and the measuring pipe (14) Characterized by being filled by a partial stream of fuel sent by the supply device (40) A filling level measuring device for a fuel tank of an automobile. 2. A supply device (40) is connected to the supply device (40) via a line ( The fuel is fed into the measuring pipe (14) via the connection (54) which is narrower than in the case of (50). The filling level measuring device according to claim 1, wherein the filling level is measured. 3. The fuel is supplied by the supply device (40) to the lower end (30) of the measuring tube (14). 3. The filling level measurement as claimed in claim 1, wherein the filling level is sent into the measuring tube (14). apparatus. 4. Fuel flows from the measuring pipe (14) through the supply device (40) to the fuel tank (10). The measuring pipe (14) fills the fuel tank (10) at the current 4. A method according to claim 1, wherein the filling level can be emptied. Fill level measuring device. 5. A valve (60) is provided at the connection (54) between the supply device (40) and the measuring tube (14). This valve (60) is arranged so that the measuring tube (14) is connected via a connection (54). The position connected to the supply device (40) and the measurement Switchable between the position where the fixed pipe (14) is connected to the fuel tank (10) The filling level measuring device according to any one of claims 1 to 3, wherein 6. A valve (60) is provided at the connection (54) between the supply device (40) and the measuring tube (14). This valve (60) is arranged so that the measuring tube (14) is connected via a connection (54). A position connected to the supply device (40) and a position connected to the connection portion (54). 4. The filling as claimed in claim 1, wherein the filling is switchable between the first and second positions. Level measuring device. 7. The amount of fuel delivered by the supply device (40) depends on the internal combustion engine (46) of the motor vehicle. 7. A method according to claim 1, wherein said variable is a function of the current fuel requirement. The filling level measuring device as described. 8. A pressure regulator (45) is arranged in the fuel tank (10). 5) an inlet connected to the pressure side of the supply device (40) and an internal combustion engine of the motor vehicle The outlet connected to the injection device (44) of (46) and the fuel tank (10) 7. An open return pipe (47) and an open return pipe (47). Item 6. The filling level measuring device according to the item 1.
JP52960299A 1997-12-11 1998-06-26 Fill level measuring device for automotive fuel tanks Pending JP2001511258A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19755056A DE19755056A1 (en) 1997-12-11 1997-12-11 Level measuring device for a fuel tank of a motor vehicle
DE19755056.8 1997-12-11
PCT/DE1998/001746 WO1999030115A1 (en) 1997-12-11 1998-06-26 Level metering device for a fuel tank of a motor vehicle

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JP (1) JP2001511258A (en)
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BR (1) BR9807571A (en)
DE (1) DE19755056A1 (en)
WO (1) WO1999030115A1 (en)

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WO1999030115A1 (en) 1999-06-17
KR20000070642A (en) 2000-11-25
EP0966655A1 (en) 1999-12-29
DE19755056A1 (en) 1999-06-17
CN1105295C (en) 2003-04-09
BR9807571A (en) 2000-02-01
US6164325A (en) 2000-12-26

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